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Lecture 23 Chapter 11 - E one σ bond and three π bonds...

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Chapter 11 continued Lecture 23 November 20, 2009
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Valence bond theory predicts that phosphorus will use _______ hybrid orbitals in the cation, PCl 4 +. A. sp B. sp 2 C. sp 3 D. sp 3 d E. sp 3 d 2
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Valence bond theory predicts that xenon will use _____ hybrid orbitals in XeOF 4 . A. sp B. sp 2 C. sp 3 D. sp 3 d E. sp 3 d 2
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Orbital Overlap: σ and π bonds
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According to valence bond theory, the bond between carbon and nitrogen in hydrogen cyanide (HCN) consists of A. no σ bonds and three π bonds B. one σ bond and two π bonds C. two σ bonds and one π bond D. three σ bonds and no π bonds
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Unformatted text preview: E. one σ bond and three π bonds Molecular Rotation A note on isomers: Simply stated, Isomers are molecules that have the same molecular formula but a different arrangement of atoms. We will discuss isomers in more detail when we cover Chapter 15 in lecture. The main concept that you should get from the previous slide is that sigma bonds allow rotation about them and pi bonds do not. So, if we have different arrangements of atoms around a double bond, then we often end up with isomers that have different chemical properties (like molecular polarity for example.) The cis- and trans- isomers of 1,2 dichloroethylene are two different molecules because we can’t just rotate around the double bond to form the two different arrangements of atoms. Molecular Orbital Theory Here are two links to videos that show the paramagnetism of liquid oxygen: http://chemed.chem.purdue.edu/demos/main_pages/8.6.html www.youtube.com/watch?v=y.Js5ENtilIo...
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